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Simplifying -5x2 + -11x + 7 = 0 Reorder the terms: 7 + -11x + -5x2 = 0 Solving 7 + -11x + -5x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by -5 the coefficient of the squared term: Divide each side by '-5'. -1.4 + 2.2x + x2 = 0 Move the constant term to the right: Add '1.4' to each side of the equation. -1.4 + 2.2x + 1.4 + x2 = 0 + 1.4 Reorder the terms: -1.4 + 1.4 + 2.2x + x2 = 0 + 1.4 Combine like terms: -1.4 + 1.4 = 0.0 0.0 + 2.2x + x2 = 0 + 1.4 2.2x + x2 = 0 + 1.4 Combine like terms: 0 + 1.4 = 1.4 2.2x + x2 = 1.4 The x term is 2.2x. Take half its coefficient (1.1). Square it (1.21) and add it to both sides. Add '1.21' to each side of the equation. 2.2x + 1.21 + x2 = 1.4 + 1.21 Reorder the terms: 1.21 + 2.2x + x2 = 1.4 + 1.21 Combine like terms: 1.4 + 1.21 = 2.61 1.21 + 2.2x + x2 = 2.61 Factor a perfect square on the left side: (x + 1.1)(x + 1.1) = 2.61 Calculate the square root of the right side: 1.615549442 Break this problem into two subproblems by setting (x + 1.1) equal to 1.615549442 and -1.615549442.Subproblem 1
x + 1.1 = 1.615549442 Simplifying x + 1.1 = 1.615549442 Reorder the terms: 1.1 + x = 1.615549442 Solving 1.1 + x = 1.615549442 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.1' to each side of the equation. 1.1 + -1.1 + x = 1.615549442 + -1.1 Combine like terms: 1.1 + -1.1 = 0.0 0.0 + x = 1.615549442 + -1.1 x = 1.615549442 + -1.1 Combine like terms: 1.615549442 + -1.1 = 0.515549442 x = 0.515549442 Simplifying x = 0.515549442Subproblem 2
x + 1.1 = -1.615549442 Simplifying x + 1.1 = -1.615549442 Reorder the terms: 1.1 + x = -1.615549442 Solving 1.1 + x = -1.615549442 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.1' to each side of the equation. 1.1 + -1.1 + x = -1.615549442 + -1.1 Combine like terms: 1.1 + -1.1 = 0.0 0.0 + x = -1.615549442 + -1.1 x = -1.615549442 + -1.1 Combine like terms: -1.615549442 + -1.1 = -2.715549442 x = -2.715549442 Simplifying x = -2.715549442Solution
The solution to the problem is based on the solutions from the subproblems. x = {0.515549442, -2.715549442}
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